Flask throws TemplateNotFound even when required template is in /templates

Question

I'm working on a Flask based Webapp. When I ran my app.py on localhost:5000/ it works for the first three pages. I can navigate home>users>viewuser. But when i launch the hub.html file from viewuser, jinja threw a TemplateNotFound error. I do have a templates folder. The other webpages are rendered from the same folder. Why is it throwing an exception at just this page?

called function in app.py:

@app.route("/hub")
def hub():
    users = service.pullusers()
    return render_template('hub', ulist=users)

caller function in viewuser.html

<div>
   <br><br><br><a class="btn btn-primary btn-xl" href={{ url_for('hub')}}>Transfer Credits</a>
</div>

file tree:

C:.
│   a.txt
│   app.py
│   main.css
│   models.py
│   service.py
│
├───static
│   ├───css
│   │       custom-responsive-styles.css
│   │       main.css
│   │       styles.css
│   │
│   └───js
│           all-plugins.js
│           jquery-3.2.1.min.js
│           plugins-activate.js
│
├───templates
│       home.html
│       hub.html
│       sendcreds.html
│       users.html
│       viewuser.html
│
└───__pycache__
        models.cpython-37.pyc
        service.cpython-37.pyc

Error:

jinja2.exceptions.TemplateNotFound

jinja2.exceptions.TemplateNotFound: hub
Traceback (most recent call last)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2464, in __call__

    return self.wsgi_app(environ, start_response)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2450, in wsgi_app

    response = self.handle_exception(e)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1867, in handle_exception

    reraise(exc_type, exc_value, tb)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\_compat.py", line 39, in reraise

    raise value

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2447, in wsgi_app

    response = self.full_dispatch_request()

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request

    rv = self.handle_user_exception(e)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1821, in handle_user_exception

    reraise(exc_type, exc_value, tb)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\_compat.py", line 39, in reraise

    raise value

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request

    rv = self.dispatch_request()

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1936, in dispatch_request

    return self.view_functions[rule.endpoint](**req.view_args)

    File "C:\Users\samar\Documents\TSF\app.py", line 26, in hub

    return render_template('hub', ulist=users)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\templating.py", line 138, in render_template

    ctx.app.jinja_env.get_or_select_template(template_name_or_list),

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\jinja2\environment.py", line 930, in get_or_select_template

    return self.get_template(template_name_or_list, parent, globals)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\jinja2\environment.py", line 883, in get_template

    return self._load_template(name, self.make_globals(globals))

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\jinja2\environment.py", line 857, in _load_template

    template = self.loader.load(self, name, globals)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\jinja2\loaders.py", line 115, in load

    source, filename, uptodate = self.get_source(environment, name)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\templating.py", line 60, in get_source

    return self._get_source_fast(environment, template)

    File "C:\Users\samar\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\templating.py", line 89, in _get_source_fast

    raise TemplateNotFound(template)

    jinja2.exceptions.TemplateNotFound: hub

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What am i doing wrong? Please help me fast. I'm on a roll.

Answer 1

You need to write the template name with extension. Or you can say as it is. write 'hub.html' instead of 'hub' in render template. And you also need to return a ok status code (200).

@app.route("/hub")
def hub():
    users = service.pullusers()
    return render_template('hub.html', ulist=users), 200